You can use access control in Signavio Workflow Accelerator to restrict who can access a process,
or specific tasks within a process.
Processes and tasks default to public accessibility, which means that all users in the organization have access.
When you configure access controls,
you restrict access to specific users or groups.

Suppose you have a process that includes an approval,
where someone from a Managers group must approve or reject a request from someone in the Employees group.
You need to use the Edit task permission to restrict access to the approval user task,
so that only managers can provide the approval.